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  <title>Test for default action of WheelEvent</title>
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    <div id="scrolled" style="width: 5000px; height: 5000px;">
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
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      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
      Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
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<pre id="test">
<script type="application/javascript">

SimpleTest.waitForFocus(runTests, window);
SimpleTest.requestFlakyTimeout("untriaged");

var winUtils = SpecialPowers.getDOMWindowUtils(window);
// grab refresh driver
winUtils.advanceTimeAndRefresh(100);

var gScrollableElement = document.getElementById("scrollable");
var gScrolledElement = document.getElementById("scrolled");
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function is()
{
  window.opener.is.apply(window.opener, arguments);
}

function ok()
{
  window.opener.ok.apply(window.opener, arguments);
}

function sendWheelAndWait(aX, aY, aEvent, aCallback)
{
  sendWheelAndPaint(gScrollableElement, aX, aY, aEvent, aCallback);
}

function hitEventLoop(aFunc, aTimes)
{
  winUtils.advanceTimeAndRefresh(100);

  if (--aTimes) {
    setTimeout(hitEventLoop, 0, aFunc, aTimes);
  } else {
    setTimeout(aFunc, 20);
  }
}

const zoomResetTopic = "browser-fullZoom:zoomReset";
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function onZoomReset(aCallback) {
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  SpecialPowers.addObserver(function observe() {
    SpecialPowers.removeObserver(observe, specialPowersTopic);
    SimpleTest.executeSoon(aCallback);
  }, specialPowersTopic, false);
}

function setDeltaMultiplierSettings(aSettings, aCallback)
{
  SpecialPowers.pushPrefEnv({"set": [
    ["mousewheel.default.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.default.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.default.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_alt.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_alt.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_alt.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_control.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_control.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_control.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_meta.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_meta.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_meta.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_shift.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_shift.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_shift.delta_multiplier_z", aSettings.deltaMultiplierZ * 100],
    ["mousewheel.with_win.delta_multiplier_x", aSettings.deltaMultiplierX * 100],
    ["mousewheel.with_win.delta_multiplier_y", aSettings.deltaMultiplierY * 100],
    ["mousewheel.with_win.delta_multiplier_z", aSettings.deltaMultiplierZ * 100]
   ]}, aCallback);
}

function doTestScroll(aSettings, aCallback)
{
  const kNoScroll    = 0x00;
  const kScrollUp    = 0x01;
  const kScrollDown  = 0x02;
  const kScrollLeft  = 0x04;
  const kScrollRight = 0x08;

  const kTests = [
    { description: "Scroll to bottom by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by pixel scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by pixel scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by pixel scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by pixel scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by pixel scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by pixel scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by pixel scroll for z",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },

    { description: "Scroll to bottom by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by line scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by line scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by line scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by line scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by line scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by line scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by line scroll for z",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },

    { description: "Scroll to bottom by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by page scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by page scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by page scroll when lineOrPageDelta is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by page scroll even if lineOrPageDelta is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by page scroll when lineOrPageDelta is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by page scroll",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by page scroll for z",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: false,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },

    // special cases.

    // momentum scroll should cause scroll even if the action is zoom, but if the default action is none,
    // shouldn't do it.
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is -1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is 0, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is -1, even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by momentum pixel scroll even if the action is zoom",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by momentum pixel scroll for z (action is zoom)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },
    { description: "Not Scroll by momentum pixel scroll if default action is none (action is zoom)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: true, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll,
      prepare: function (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 0]]}, cb); },
      cleanup: function (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 1]]}, cb); } },

    // momentum scroll should cause scroll even if the action is history, but if the default action is none,
    // shouldn't do it.
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to bottom by momentum pixel scroll when lineOrPageDelta is 1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to top by momentum pixel scroll when lineOrPageDelta is -1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to right by momentum pixel scroll when lineOrPageDelta is 1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is 0, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to left by momentum pixel scroll when lineOrPageDelta is -1, even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to bottom-right by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollRight },
    { description: "Scroll to bottom-left by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown | kScrollLeft },
    { description: "Scroll to top-left by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollLeft },
    { description: "Scroll to top-right by momentum pixel scroll even if the action is history",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp | kScrollRight },
    { description: "Not Scroll by momentum pixel scroll for z (action is history)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },
    { description: "Not Scroll by momentum pixel scroll if default action is none (action is history)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0, isMomentum: true,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: true, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll,
      prepare: function (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 0]]}, cb); },
      cleanup: function (cb) { SpecialPowers.pushPrefEnv({"set": [["mousewheel.default.action", 1]]}, cb); } },

    // Don't scroll along axis whose overflow style is hidden.
    { description: "Scroll to only bottom by oblique pixel wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown,
      prepare: function(cb) { gScrollableElement.style.overflowX = "hidden"; cb(); } },
    { description: "Scroll to only bottom by oblique line wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to only bottom by oblique page wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to only top by oblique pixel wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique line wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique page wheel event with overflow-x: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp,
      cleanup: function (cb) { gScrollableElement.style.overflowX = "auto"; cb(); } },
    { description: "Scroll to only right by oblique pixel wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight,
      prepare: function(cb) { gScrollableElement.style.overflowY = "hidden"; cb(); } },
    { description: "Scroll to only right by oblique line wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to only right by oblique page wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to only left by oblique pixel wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique line wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique page wheel event with overflow-y: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft,
      cleanup: function (cb) { gScrollableElement.style.overflowY = "auto"; cb(); } },
    { description: "Don't be scrolled by oblique pixel wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll,
      prepare: function(cb) { gScrollableElement.style.overflow = "hidden"; cb(); } },
    { description: "Don't be scrolled by oblique line wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique page wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 1, expectedOverflowDeltaY: 1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique pixel wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique line wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll },
    { description: "Don't be scrolled by oblique page wheel event with overflow: hidden",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: -1, expectedOverflowDeltaY: -1,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kNoScroll,
      cleanup: function (cb) { gScrollableElement.style.overflow = "auto"; cb(); } },

    // Don't scroll along axis whose overflow style is hidden and overflow delta values should
    // be zero if there is ancestor scrollable element.
    { description: "Scroll to only bottom by oblique pixel wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown,
      prepare: function(cb) {
        gScrollableElement.style.overflowX = "hidden";
        gScrollableElement.style.position = "fixed";
        gScrollableElement.style.top = "30px";
        gScrollableElement.style.left = "30px";
        // Make body element scrollable.
        gSpacerForBodyElement.style.width = "5000px";
        gSpacerForBodyElement.style.height = "5000px";
        document.documentElement.scrollTop = 500;
        document.documentElement.scrollLeft = 500;
        cb();
      } },
    { description: "Scroll to only bottom by oblique line wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to only bottom by oblique page wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollDown },
    { description: "Scroll to only top by oblique pixel wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique line wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp },
    { description: "Scroll to only top by oblique page wheel event with overflow-x: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollUp,
      cleanup: function (cb) { gScrollableElement.style.overflowX = "auto"; cb(); } },
    { description: "Scroll to only right by oblique pixel wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 16.0, deltaY: 16.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight,
      prepare: function(cb) { gScrollableElement.style.overflowY = "hidden"; cb(); } },
    { description: "Scroll to only right by oblique line wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to only right by oblique page wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 1.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollRight },
    { description: "Scroll to only left by oblique pixel wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -16.0, deltaY: -16.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique line wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft },
    { description: "Scroll to only top by oblique page wheel event with overflow-y: hidden (body is scrollable)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: -1.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0,
               shiftKey: false, ctrlKey: false, altKey: false, metaKey: false, osKey: false },
      expected: kScrollLeft,
      cleanup: function (cb) {
        gScrollableElement.style.overflowY = "auto";
        gScrollableElement.style.position = "static";
        gSpacerForBodyElement.style.width = "";
        gSpacerForBodyElement.style.height = "";
        cb();
      } },
  ];

  var description;

  var currentTestIndex = -1;
  var isXReverted = (aSettings.deltaMultiplierX < 0);
  var isYReverted = (aSettings.deltaMultiplierY < 0);

  function doNextTest()
  {
    if (++currentTestIndex >= kTests.length) {
      SimpleTest.executeSoon(aCallback);
      return;
    }

    gScrollableElement.scrollTop = 1000;
    gScrollableElement.scrollLeft = 1000;

    var currentTest = kTests[currentTestIndex];
    description = "doTestScroll(aSettings=" + aSettings.description + "), " + currentTest.description + ": ";
    if (currentTest.prepare) {
      currentTest.prepare(doTestCurrentScroll);
    } else {
      doTestCurrentScroll();
    }
  }

  function doTestCurrentScroll() {
    var currentTest = kTests[currentTestIndex];
    sendWheelAndWait(10, 10, currentTest.event, function () {
      if (currentTest.expected == kNoScroll) {
        is(gScrollableElement.scrollTop, 1000, description + "scrolled vertical");
        is(gScrollableElement.scrollLeft, 1000, description + "scrolled horizontal");
      } else {
        var scrollUp = !isYReverted ? (currentTest.expected & kScrollUp) :
                                      (currentTest.expected & kScrollDown);
        var scrollDown = !isYReverted ? (currentTest.expected & kScrollDown) :
                                        (currentTest.expected & kScrollUp);
        if (scrollUp) {
          ok(gScrollableElement.scrollTop < 1000, description + "not scrolled up, got " + gScrollableElement.scrollTop);
        } else if (scrollDown) {
          ok(gScrollableElement.scrollTop > 1000, description + "not scrolled down, got " + gScrollableElement.scrollTop);
        } else {
          is(gScrollableElement.scrollTop, 1000, description + "scrolled vertical");
        }
        var scrollLeft = !isXReverted ? (currentTest.expected & kScrollLeft) :
                                        (currentTest.expected & kScrollRight);
        var scrollRight = !isXReverted ? (currentTest.expected & kScrollRight) :
                                         (currentTest.expected & kScrollLeft);
        if (scrollLeft) {
          ok(gScrollableElement.scrollLeft < 1000, description + "not scrolled to left, got " + gScrollableElement.scrollLeft);
        } else if (scrollRight) {
          ok(gScrollableElement.scrollLeft > 1000, description + "not scrolled to right, got " + gScrollableElement.scrollLeft);
        } else {
          is(gScrollableElement.scrollLeft, 1000, description + "scrolled horizontal");
        }
      }
      if (currentTest.cleanup) {
        currentTest.cleanup(nextStep);
      } else {
        nextStep();
      }

      function nextStep() {
        winUtils.advanceTimeAndRefresh(100);
        doNextTest();
      }
    });
  }
  doNextTest();
}

function doTestZoom(aSettings, aCallback)
{
  if ((aSettings.deltaMultiplierX != 1.0  && aSettings.deltaMultiplierX != -1.0) ||
      (aSettings.deltaMultiplierY != 1.0  && aSettings.deltaMultiplierY != -1.0)) {
    todo(false, "doTestZoom doesn't support to test with aSettings=" + aSettings.description);
    SimpleTest.executeSoon(aCallback);
    return;
  }

  const kNone     = 0x00;
  const kPositive = 0x01;
  const kNegative = 0x02;
  const kUseX     = 0x10;
  const kUseY     = 0x20;
  const kTests = [
    { description: "by vertical/positive pixel event when its lineOrPageDeltaY is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by vertical/positive pixel event when its lineOrPageDeltaY is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kPositive | kUseY },
    { description: "by vertical/negative pixel event when its lineOrPageDeltaY is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by vertical/negative pixel event when its lineOrPageDeltaY is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -8.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNegative | kUseY },
    { description: "by horizotal/positive pixel event when its lineOrPageDeltaX is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by horizotal/positive pixel event when its lineOrPageDeltaX is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kPositive | kUseX },
    { description: "by horizotal/negative pixel event when its lineOrPageDeltaX is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by horizotal/negative pixel event when its lineOrPageDeltaX is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -8.0, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNegative | kUseX },
    { description: "by z pixel event",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 16.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },

    { description: "by vertical/positive line event when its lineOrPageDeltaY is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by vertical/positive line event when its lineOrPageDeltaY is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kPositive | kUseY },
    { description: "by vertical/negative line event when its lineOrPageDeltaY is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by vertical/negative line event when its lineOrPageDeltaY is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNegative | kUseY },
    { description: "by horizotal/positive line event when its lineOrPageDeltaX is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by horizotal/positive line event when its lineOrPageDeltaX is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kPositive | kUseX },
    { description: "by horizotal/negative line event when its lineOrPageDeltaX is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by horizotal/negative line event when its lineOrPageDeltaX is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNegative | kUseX },
    { description: "by z line event",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },

    { description: "by vertical/positive page event when its lineOrPageDeltaY is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by vertical/positive page event when its lineOrPageDeltaY is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kPositive | kUseY },
    { description: "by vertical/negative page event when its lineOrPageDeltaY is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by vertical/negative page event when its lineOrPageDeltaY is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -0.5, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNegative | kUseY },
    { description: "by horizotal/positive page event when its lineOrPageDeltaX is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by horizotal/positive page event when its lineOrPageDeltaX is 1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kPositive | kUseX },
    { description: "by horizotal/negative page event when its lineOrPageDeltaX is 0",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
    { description: "by horizotal/negative page event when its lineOrPageDeltaX is -1",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -0.5, deltaY: 0.0, deltaZ: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNegative | kUseX },
    { description: "by z page event",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 0.0, deltaZ: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0,
               expectedOverflowDeltaX: 0, expectedOverflowDeltaY: 0 },
      expected: kNone },
  ];

  var description, currentTest;
  var currentTestIndex = -1;
  var isXReverted = (aSettings.deltaMultiplierX < 0);
  var isYReverted = (aSettings.deltaMultiplierY < 0);

  function doNextTest()
  {
    if (++currentTestIndex >= kTests.length) {
      SimpleTest.executeSoon(aCallback);
      return;
    }

    gScrollableElement.scrollTop = 1000;
    gScrollableElement.scrollLeft = 1000;

    currentTest = kTests[currentTestIndex];
    description = "doTestZoom(aSettings=" + aSettings.description + "), ";
    if (currentTest.expected == kNone) {
      description += "Shouldn't ";
    } else {
      description += "Should ";
    }
    description += "zoom " + currentTest.description + ": ";

    var event = currentTest.event;
    event.ctrlKey  = true;

    // NOTE: Zooming might change scrollTop and scrollLeft by rounding fraction.
    //       This test assume that zoom happens synchronously and scrolling
    //       happens asynchronously.
    var scrollTop = gScrollableElement.scrollTop;
    var scrollLeft = gScrollableElement.scrollLeft;

    sendWheelAndWait(10, 10, event, function () {
      is(gScrollableElement.scrollTop, scrollTop, description + "scrolled vertical");
      is(gScrollableElement.scrollLeft, scrollLeft, description + "scrolled horizontal");
      if (!(currentTest.expected & (kNegative | kPositive))) {
        is(SpecialPowers.getFullZoom(window), 1.0, description + "zoomed");
      } else {
        var isReverted = (currentTest.expected & kUseX) ? isXReverted :
                         (currentTest.expected & kUseY) ? isYReverted : false;
        if ((!isReverted && (currentTest.expected & kNegative)) ||
            (isReverted && (currentTest.expected & kPositive))) {
          ok(SpecialPowers.getFullZoom(window) > 1.0,
             description + "not zoomed in, got " + SpecialPowers.getFullZoom(window));
        } else {
          ok(SpecialPowers.getFullZoom(window) < 1.0,
             description + "not zoomed out, got " + SpecialPowers.getFullZoom(window));
        }
      }

      synthesizeKey("0", { accelKey: true });
      onZoomReset(function () {
        hitEventLoop(doNextTest, 20);
      });
    });
  }
  doNextTest();
}

function doTestZoomedScroll(aCallback)
{
  var zoom = 1.0;
  function setFullZoom(aWindow, aZoom)
  {
    zoom = aZoom;
    SpecialPowers.setFullZoom(aWindow, aZoom);
  }

  function prepareTestZoomedPixelScroll()
  {
    // Reset zoom and store the scroll amount into the data.
    synthesizeKey("0", { accelKey: true });
    zoom = 1.0;
    onZoomReset(testZoomedPixelScroll);
  }

  function testZoomedPixelScroll()
  {
    gScrollableElement.scrollTop = 1000;
    gScrollableElement.scrollLeft = 1000;
    // Ensure not to be in reflow.
    hitEventLoop(function () {
      function mousePixelScrollHandler(aEvent)
      {
        if (aEvent.axis == MouseScrollEvent.HORIZONTAL_AXIS) {
          is(aEvent.detail, 16,
             "doTestZoomedScroll: The detail of horizontal MozMousePixelScroll for pixel wheel event is wrong");
        } else if (aEvent.axis == MouseScrollEvent.VERTICAL_AXIS) {
          is(aEvent.detail, 16,
             "doTestZoomedScroll: The detail of vertical MozMousePixelScroll for pixel wheel event is wrong");
        } else {
          ok(false, "doTestZoomedScroll: The axis of MozMousePixelScroll for pixel wheel event is invalid, got " + aEvent.axis);
        }
      }
      function wheelHandler(aEvent)
      {
        is(aEvent.deltaX, 16.0 / zoom,
           "doTestZoomedScroll: The deltaX of wheel for pixel is wrong");
        is(aEvent.deltaY, 16.0 / zoom,
           "doTestZoomedScroll: The deltaY of wheel for pixel is wrong");
      }
      window.addEventListener("MozMousePixelScroll", mousePixelScrollHandler, true);
      window.addEventListener("wheel", wheelHandler, true);
      var event = {
        deltaMode: WheelEvent.DOM_DELTA_PIXEL,
        deltaX: 16.0,
        deltaY: 16.0,
        lineOrPageDeltaX: 0,
        lineOrPageDeltaY: 0
      };
      // wait scrolled actually.
      sendWheelAndWait(10, 10, event, function () {
        var scrolledX = gScrollableElement.scrollLeft;
        var scrolledY = gScrollableElement.scrollTop;
        ok(scrolledX > 1000,
           "doTestZoomedScroll: scrolledX must be larger than 1000 for pixel wheel event, got " + scrolledX);
        ok(scrolledY > 1000,
           "doTestZoomedScroll: scrolledY must be larger than 1000 for pixel wheel event, got " + scrolledY);

        // Zoom
        setFullZoom(window, 2.0);
        // Ensure not to be in reflow.
        hitEventLoop(function () {
          gScrollableElement.scrollTop = 1000;
          gScrollableElement.scrollLeft = 1000;
          var event = {
            deltaMode: WheelEvent.DOM_DELTA_PIXEL,
            deltaX: 16.0,
            deltaY: 16.0,
            lineOrPageDeltaX: 0,
            lineOrPageDeltaY: 0
          };
          // wait scrolled actually.
          sendWheelAndWait(10, 10, event, function () {
            ok(Math.abs(gScrollableElement.scrollLeft - (1000 + (scrolledX - 1000) / 2)) <= 1,
               "doTestZoomedScroll: zoomed horizontal scroll amount by pixel wheel event is different from normal, scrollLeft=" +
                 gScrollableElement.scrollLeft + ", scrolledX=" + scrolledX);
            ok(Math.abs(gScrollableElement.scrollTop - (1000 + (scrolledY - 1000) / 2)) <= 1,
               "doTestZoomedScroll: zoomed vertical scroll amount by pixel wheel event is different from normal, scrollTop=" +
                 gScrollableElement.scrollTop + ", scrolledY=" + scrolledY);
            window.removeEventListener("MozMousePixelScroll", mousePixelScrollHandler, true);
            window.removeEventListener("wheel", wheelHandler, true);

            synthesizeKey("0", { accelKey: true });
            onZoomReset(prepareTestZoomedLineScroll);
          });
        }, 20);
      });
    }, 20);
  }

  function prepareTestZoomedLineScroll()
  {
    // Reset zoom and store the scroll amount into the data.
    synthesizeKey("0", { accelKey: true });
    zoom = 1.0;
    onZoomReset(testZoomedLineScroll);
  }
  function testZoomedLineScroll()
  {
    gScrollableElement.scrollTop = 1000;
    gScrollableElement.scrollLeft = 1000;
    // Ensure not to be in reflow.
    hitEventLoop(function () {
      var lineHeightX, lineHeightY;
      function handler(aEvent)
      {
        if (aEvent.axis == MouseScrollEvent.HORIZONTAL_AXIS) {
          if (lineHeightX == undefined) {
            lineHeightX = aEvent.detail;
          } else {
            ok(Math.abs(aEvent.detail - lineHeightX) <= 1,
               "doTestZoomedScroll: The detail of horizontal MozMousePixelScroll for line wheel event is wrong, aEvent.detail=" +
                 aEvent.detail + ", lineHeightX=" + lineHeightX);
          }
        } else if (aEvent.axis == MouseScrollEvent.VERTICAL_AXIS) {
          if (lineHeightY == undefined) {
            lineHeightY = aEvent.detail;
          } else {
            ok(Math.abs(aEvent.detail - lineHeightY) <= 1,
               "doTestZoomedScroll: The detail of vertical MozMousePixelScroll for line wheel event is wrong, aEvent.detail=" +
                 aEvent.detail + ", lineHeightY=" + lineHeightY);
          }
        } else {
          ok(false, "doTestZoomedScroll: The axis of MozMousePixelScroll for line wheel event is invalid, got " + aEvent.axis);
        }
      }
      window.addEventListener("MozMousePixelScroll", handler, true);
      var event = {
        deltaMode: WheelEvent.DOM_DELTA_LINE,
        deltaX: 1.0,
        deltaY: 1.0,
        lineOrPageDeltaX: 1,
        lineOrPageDeltaY: 1
      };
      // wait scrolled actually.
      sendWheelAndWait(10, 10, event, function () {
        var scrolledX = gScrollableElement.scrollLeft;
        var scrolledY = gScrollableElement.scrollTop;
        ok(scrolledX > 1000,
           "doTestZoomedScroll: scrolledX must be larger than 1000 for line wheel event, got " + scrolledX);
        ok(scrolledY > 1000,
           "doTestZoomedScroll: scrolledY must be larger than 1000 for line wheel event, got " + scrolledY);

        // Zoom
        setFullZoom(window, 2.0);
        // Ensure not to be in reflow.
        hitEventLoop(function () {
          gScrollableElement.scrollTop = 1000;
          gScrollableElement.scrollLeft = 1000;
          var event = {
            deltaMode: WheelEvent.DOM_DELTA_LINE,
            deltaX: 1.0,
            deltaY: 1.0,
            lineOrPageDeltaX: 1,
            lineOrPageDeltaY: 1
          };
          // wait scrolled actually.
          sendWheelAndWait(10, 10, event, function () {
            ok(Math.abs(gScrollableElement.scrollLeft - scrolledX) <= 1,
               "doTestZoomedScroll: zoomed horizontal scroll amount by line wheel event is different from normal, scrollLeft=" +
                 gScrollableElement.scrollLeft + ", scrolledX=" + scrolledX);
            ok(Math.abs(gScrollableElement.scrollTop - scrolledY) <= 1,
               "doTestZoomedScroll: zoomed vertical scroll amount by line wheel event is different from normal, scrollTop=" +
                 gScrollableElement.scrollTop + ", scrolledY=" + scrolledY);

            window.removeEventListener("MozMousePixelScroll", handler, true);

            synthesizeKey("0", { accelKey: true });
            onZoomReset(aCallback);
          });
        }, 20);
      });
    }, 20);
  }

  // XXX It's too difficult to test page scroll because the page scroll amount
  //     is computed by complex logic.

  prepareTestZoomedPixelScroll();
}

function doTestWholeScroll(aCallback)
{
  SpecialPowers.pushPrefEnv({"set": [
    ["mousewheel.default.delta_multiplier_x", 999999],
    ["mousewheel.default.delta_multiplier_y", 999999]]},
    function() { doTestWholeScroll2(aCallback); });
}

function doTestWholeScroll2(aCallback)
{
  const kTests = [
    { description: "try whole-scroll to top (line)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1 },
      expectedScrollTop: 0,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to top when scrollTop is already top-most (line)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: -1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1 },
      expectedScrollTop: 0,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to bottom (line)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.0, deltaY: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1 },
      expectedScrollTop: gScrollableElement.scrollTopMax,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to bottom when scrollTop is already bottom-most (line)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0, deltaY: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1 },
      expectedScrollTop: gScrollableElement.scrollTopMax,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to left (line)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: 0
    },
    { description: "try whole-scroll to left when scrollLeft is already left-most (line)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: -1.0, deltaY: 0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: 0
    },
    { description: "try whole-scroll to right (line)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: gScrollableElement.scrollLeftMax
    },
    { description: "try whole-scroll to right when scrollLeft is already right-most (line)",
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: gScrollableElement.scrollLeftMax
    },


    { description: "try whole-scroll to top (pixel)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: 0,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to top when scrollTop is already top-most (pixel)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: -1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: 0,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to bottom (pixel)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0.0, deltaY: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: gScrollableElement.scrollTopMax,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to bottom when scrollTop is already bottom-most (pixel)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 0, deltaY: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: gScrollableElement.scrollTopMax,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to left (pixel)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -1.0, deltaY: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: 0
    },
    { description: "try whole-scroll to left when scrollLeft is already left-most (pixel)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: -1.0, deltaY: 0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: 0
    },
    { description: "try whole-scroll to right (pixel)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 1.0, deltaY: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: gScrollableElement.scrollLeftMax
    },
    { description: "try whole-scroll to right when scrollLeft is already right-most (pixel)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
               deltaX: 1.0, deltaY: 0.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: gScrollableElement.scrollLeftMax
    },


    { description: "try whole-scroll to top (page)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1 },
      expectedScrollTop: 0,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to top when scrollTop is already top-most (page)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: -1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: -1 },
      expectedScrollTop: 0,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to bottom (page)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0.0, deltaY: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1 },
      expectedScrollTop: gScrollableElement.scrollTopMax,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to bottom when scrollTop is already bottom-most (page)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 0, deltaY: 1.0,
               lineOrPageDeltaX: 0, lineOrPageDeltaY: 1 },
      expectedScrollTop: gScrollableElement.scrollTopMax,
      expectedScrollLeft: 1000
    },
    { description: "try whole-scroll to left (page)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: 0.0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: 0
    },
    { description: "try whole-scroll to left when scrollLeft is already left-most (page)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: -1.0, deltaY: 0,
               lineOrPageDeltaX: -1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: 0
    },
    { description: "try whole-scroll to right (page)",
      prepare: function () {
        gScrollableElement.scrollTop = 1000;
        gScrollableElement.scrollLeft = 1000;
      },
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: gScrollableElement.scrollLeftMax
    },
    { description: "try whole-scroll to right when scrollLeft is already right-most (page)",
      event: { deltaMode: WheelEvent.DOM_DELTA_PAGE,
               deltaX: 1.0, deltaY: 0.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 0 },
      expectedScrollTop: 1000,
      expectedScrollLeft: gScrollableElement.scrollLeftMax
    },
  ];

  var index = 0;

  function doIt()
  {
    const kTest = kTests[index];
    if (kTest.prepare) {
      kTest.prepare();
    }
    sendWheelAndWait(10, 10, kTest.event, function () {
      is(gScrollableElement.scrollTop, kTest.expectedScrollTop,
         "doTestWholeScroll, " + kTest.description + ": unexpected scrollTop");
      is(gScrollableElement.scrollLeft, kTest.expectedScrollLeft,
         "doTestWholeScroll, " + kTest.description + ": unexpected scrollLeft");
      if (++index == kTests.length) {
        SimpleTest.executeSoon(aCallback);
      } else {
        doIt();
      }
    });
  }
  doIt();
}

function doTestActionOverride(aCallback)
{
  const kNoScroll    = 0x00;
  const kScrollUp    = 0x01;
  const kScrollDown  = 0x02;
  const kScrollLeft  = 0x04;
  const kScrollRight = 0x08;

  const kTests = [
    { action: 1, override_x: -1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 1, override_x: 0,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 1, override_x: 1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 0, override_x: -1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 0, override_x: 0,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 0, override_x: 1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 1, override_x: -1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.5,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 1, override_x: 0,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.5,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 1, override_x: 1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.5,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 0, override_x: -1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.5,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 0, override_x: 0,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.5,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 0, override_x: 1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 1.0, deltaY: 0.5,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 1, override_x: -1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 1, override_x: 0,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 1, override_x: 1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kScrollDown | kScrollRight
    },
    { action: 0, override_x: -1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 0, override_x: 0,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
    { action: 0, override_x: 1,
      event: { deltaMode: WheelEvent.DOM_DELTA_LINE,
               deltaX: 0.5, deltaY: 1.0,
               lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
      expected: kNoScroll
    },
  ];

  var index = 0;

  function doIt()
  {
    const kTest = kTests[index];
    SpecialPowers.pushPrefEnv({"set": [
      ["mousewheel.default.action", kTest.action],
      ["mousewheel.default.action.override_x", kTest.override_x]]},
      doIt2
    );
  }

  function doIt2()
  {
    const kTest = kTests[index];
    description = "doTestActionOverride(action=" + kTest.action + ", " +
                  "override_x=" + kTest.override_x + ", " +
                  "deltaX=" + kTest.event.deltaX + ", " +
                  "deltaY=" + kTest.event.deltaY + "): ";
    gScrollableElement.scrollTop = 1000;
    gScrollableElement.scrollLeft = 1000;
    sendWheelAndWait(10, 10, kTest.event, function () {
      if (kTest.expected & kScrollUp) {
        ok(gScrollableElement.scrollTop < 1000, description + "not scrolled up, got " + gScrollableElement.scrollTop);
      } else if (kTest.expected & kScrollDown) {
        ok(gScrollableElement.scrollTop > 1000, description + "not scrolled down, got " + gScrollableElement.scrollTop);
      } else {
        is(gScrollableElement.scrollTop, 1000, description + "scrolled vertical");
      }
      if (kTest.expected & kScrollLeft) {
        ok(gScrollableElement.scrollLeft < 1000, description + "not scrolled to left, got " + gScrollableElement.scrollLeft);
      } else if (kTest.expected & kScrollRight) {
        ok(gScrollableElement.scrollLeft > 1000, description + "not scrolled to right, got " + gScrollableElement.scrollLeft);
      } else {
        is(gScrollableElement.scrollLeft, 1000, description + "scrolled horizontal");
      }
      if (++index == kTests.length) {
        SimpleTest.executeSoon(aCallback);
      } else {
        doIt();
      }
    });
  }
  doIt();
}

function runTests()
{
  SpecialPowers.pushPrefEnv({"set": [
    ["test.events.async.enabled", true],
    ["general.smoothScroll", false],
    ["mousewheel.default.action", 1],      // scroll
    ["mousewheel.default.action.override_x", -1],
    ["mousewheel.with_shift.action", 2],   // history
    ["mousewheel.with_shift.action.override_x", -1],
    ["mousewheel.with_control.action", 3], // zoom
    ["mousewheel.with_control.action.override_x", -1]]},
    runTests2);
}

function runTests2()
{
  const kSettings = [
    { description: "all delta values are not customized",
      deltaMultiplierX:  1.0, deltaMultiplierY:  1.0, deltaMultiplierZ:  1.0 },
    { description: "deltaX is reverted",
      deltaMultiplierX: -1.0, deltaMultiplierY:  1.0, deltaMultiplierZ:  1.0 },
    { description: "deltaY is reverted",
      deltaMultiplierX:  1.0, deltaMultiplierY: -1.0, deltaMultiplierZ:  1.0 },
    { description: "deltaZ is reverted",
      deltaMultiplierX:  1.0, deltaMultiplierY:  1.0, deltaMultiplierZ: -1.0 },
    { description: "deltaX is 2.0",
      deltaMultiplierX:  2.0, deltaMultiplierY:  1.0, deltaMultiplierZ:  1.0 },
    { description: "deltaY is 2.0",
      deltaMultiplierX:  1.0, deltaMultiplierY:  2.0, deltaMultiplierZ:  1.0 },
    { description: "deltaZ is 2.0",
      deltaMultiplierX:  1.0, deltaMultiplierY:  1.0, deltaMultiplierZ:  2.0 },
    { description: "deltaX is -2.0",
      deltaMultiplierX: -2.0, deltaMultiplierY:  1.0, deltaMultiplierZ:  1.0 },
    { description: "deltaY is -2.0",
      deltaMultiplierX:  1.0, deltaMultiplierY: -2.0, deltaMultiplierZ:  1.0 },
    { description: "deltaZ is -2.0",
      deltaMultiplierX:  1.0, deltaMultiplierY:  1.0, deltaMultiplierZ: -2.0 },
  ];

  var index = 0;

  function doTest() {
    setDeltaMultiplierSettings(kSettings[index], function () {
      doTestScroll(kSettings[index], function () {
        doTestZoom(kSettings[index], function() {
          if (++index == kSettings.length) {
            setDeltaMultiplierSettings(kSettings[0], function() {
              doTestZoomedScroll(function() {
                doTestWholeScroll(function() {
                  doTestActionOverride(function() {
                    finishTests();
                  });
                });
              });
            });
          } else {
            doTest();
          }
        });
      });
    });
  }
  doTest();
}

function finishTests()
{
  winUtils.restoreNormalRefresh();

  window.opener.finish();
}

</script>
</pre>
</body>
</html>
